It has been a while, but I’ve finally created a version that includes controlling the salt water system too. It was quite a complicated task to get this to work as I wanted, but this new version should do what it is intended to do.
It is an extended version of this Pool Pump and Heat Controller blueprint. Currently I want to maintain the this version too, so both versions still can be used. You can find the blueprint here: Pool Pump, Heat and Salt Water System Controller